活性炭對水中MTBE和BTEX的吸附性能

摘要： 研究了活性炭對汽油成分苯系物(BTEX)和甲基叔丁基醚(MTBE)的吸附規律.結果表明:活性炭對BTEX和MTBE的吸附能力大小順序為:乙苯＞鄰二甲苯＞甲苯＞苯＞MTBE,其次序與污染物在水中的溶解度大小成反比例關系;椰殼炭是所考察活性炭中吸附性能最好、最穩定的炭型;在選炭的過程中,苯酚值可以有效地表征活性炭對于低濃度BTEX和MTBE的吸附性能.當苯系物與MTBE共同存在時,活性炭對于MTBE的吸附容量明顯降低,對于苯系物的吸附容量基本沒有改變.共存化合物的初始濃度越高,其競爭吸附效應越明顯;相比單一競爭化合物,BTEX的混合共存更顯著地降低活性炭對于MTBE的吸附.當BTEX和MTBE共存時,吸附性能較好的BTEX會將已經吸附的MTBE從活性炭上置換下來,導致了出水MTBE濃度突然升高的現象. Abstract： Series of adsorption equilibrium capacity and breakthrough experiments were conducted to study the adsorption of gasoline constituents MTBE and BTEX (benzene, toluene, ethylbenzene and xylene) from single and mixed solute solutions on activated carbons. The adsorptive capacity of granular activated carbon (GAC) in declining order was ethylbenzene ＞o-xylene ＞toluene＞ benzene＞ MTBE,consistent with the prediction based on their relative water solubility. The coconut carbon was most effective for removing MTBE and BTEX; the phenol number was a good indicator for the carbons'adsorptive capacities for BTEX and MTBE at low equilibrium concentrations. When BTEX and MTBE were both present, the carbon's capacity for MTBE was reduced while its capacity for BTEX remained nearly the same as that measured in the single solute solution. A higher concentration of co-existing toluene resulted in a greater reduction in carbon's capacity for MTBE. The mixture of BTEX resulted in greater reduction of the capacity for MTBE than the sum of individual effects. When BTEX and MTBE were both present in the feed to a small absorber, the well adsorbed BTEX displaced some of the adsorbed MTBE resulting in a short period of higher than expected effluent MTBE concentration. 作 者： 李影    張巍    呂燕    林匡飛    應維琪    LI Ying    ZHANG Wei    L(U) Yan    LIN Kuang-fei    YING Wei-chi   作者單位： 華東理工大學資源與環境工程學院,上海,200237  期 刊： 華東理工大學學報（自然科學版）  ISTICPKU   Journal： JOURNAL OF EAST CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY(NATURAL SCIENCE EDITION)  年，卷(期)： 2009, 35(6)  分類號： X703.1  關鍵詞： 活性炭    苯系物    甲基叔丁基醚    吸附性能    競爭吸附    Keywords： activated carbon    BTEX    MTBE    adsorption capacity    competitive adsorption   

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